I bought this supplement after reading that taking 2g of L-Glutamine before bed has been proven to cause an increase in HGH. I haven't had my before-and-after HGH levels measured, but something my husband & I are doing has significantly increased our energy levels, mental clarity and immune responses (no sicknesses since we started our low-carb, high nutrient, no-sugar regime + selected supplements a few months ago), so this one seems to be doing its part. We both take 2g of it every night before bed -- that's the recommendation I've read.

well I had problem with my stomach and I was tired most of the time what ever I do and eat healthy food still tired, with this product I feel more energy and even my mood stable and craving for smoking gone . miracle

The normal dose of L-Glutamine that you have to eat to feel an improvement is too high to use this product.
Each capsule it's just 1g and you won't feel anything until you use 4 or 5 per day. Before using that, ask to a nutritionist because the dose indicated in the content is not correct.

I don't want to scare anybody by posting this (your body might might not react in a similar way), but
Here is what happened to me:
After a pretty long period of time owning the product, but not using it, I decided to give it a try. I actually bought the product with the hope to increase my fitness level (muscle mass, endurance etc.). After what I read about it on the web(being the most abundant amino acid in the body and, a lot of people are deficient and many athletes see benefits from taking it) I was with high expectations about it. It was a nice detail, that in most articles I've read, they described it as safe to use, without side effects (when used in appropriate dosage) and very rare allergic reactions. After all, most of the protein foods have it (some more, that other of course) and the body needs it to survive.
BUT, when I took JUST 1 CAPSULE of it with some yogurt and food, half an hour later I ended up with nervousness, &quot;tightness&quot; (unpleasant one) and high blood pressure. I had things to do this day, but I had to call them off, since I felt really unwell. I can't tell 100%, that it was from the l-glutamine, but it would be too much of a coincidence to be otherwise.&#160;
After 1 capsule, my experience with this product in a nutshell:
It immobilized for 1 day and the whole bottle is basically useless&#160;to me.